s, nutritive solution prepared for tomatoes, and water directly from the well. Groundwater (0.65 g L
−1
of salinity) supplemented with KCl and MgNO
was used with a shrimp stocking density of 50 postlarvae shrimp per m
2
3
. Evaluations for shrimp (mean weight, growth rate, survival and yield) and for tomato plants (fruit number, mean fruit weight and yield) were performed. Daily monitoring included temperature, conductivity, pH and dissolved oxygen in shrimp tank waters. Chemical analysis in a weekly monitoring included major ions and nutrients. The shrimp yield was 11.1±0.2 kg per tank (3.9±2.0 t ha
)withamean survival of 56.3±1.1%, a mean weight of 13.9±0.4 g, and a feed conversion rate of 1.60±0.03. The yield of tomatoes irrigated with shrimp effluent (33.3±2.1 kg per 45 plants) was comparable to those irrigated with nutritive solution (35.7±1.7 kg), and significantly (Pb0.05) higher than those irrigated with groundwater (25.5±2.4 kg). The budget evidenced that most of the N (43.6%) and P (99.4%) entered to the shrimp–tomato system as shrimp food. Within the system, 13.2% and 2.1% of the input N were converted to harvested shrimp and tomato plants; similarly, 8.9% and 4.3% of the input P, were converted to harvested shrimp and tomato plants. Fromthis work, it is demonstrated that the shrimp–tomato culture system is feasible, with a water consumption rate of 2.1 m
per kg of harvested products. However, more research is needed to adjust the shrimp–tomato culture system in regards to the precise integration of the number of tomato plants per shrimp culture area and to optimize the composition of water used in terms of the major ions (concentration and ratio) and salinity
s, nutritive solution prepared for tomatoes, and water directly from the well. Groundwater (0.65 g L
−1
of salinity) supplemented with KCl and MgNO
was used with a shrimp stocking density of 50 postlarvae shrimp per m
2
3
. Evaluations for shrimp (mean weight, growth rate, survival and yield) and for tomato plants (fruit number, mean fruit weight and yield) were performed. Daily monitoring included temperature, conductivity, pH and dissolved oxygen in shrimp tank waters. Chemical analysis in a weekly monitoring included major ions and nutrients. The shrimp yield was 11.1±0.2 kg per tank (3.9±2.0 t ha
)withamean survival of 56.3±1.1%, a mean weight of 13.9±0.4 g, and a feed conversion rate of 1.60±0.03. The yield of tomatoes irrigated with shrimp effluent (33.3±2.1 kg per 45 plants) was comparable to those irrigated with nutritive solution (35.7±1.7 kg), and significantly (Pb0.05) higher than those irrigated with groundwater (25.5±2.4 kg). The budget evidenced that most of the N (43.6%) and P (99.4%) entered to the shrimp–tomato system as shrimp food. Within the system, 13.2% and 2.1% of the input N were converted to harvested shrimp and tomato plants; similarly, 8.9% and 4.3% of the input P, were converted to harvested shrimp and tomato plants. Fromthis work, it is demonstrated that the shrimp–tomato culture system is feasible, with a water consumption rate of 2.1 m
per kg of harvested products. However, more research is needed to adjust the shrimp–tomato culture system in regards to the precise integration of the number of tomato plants per shrimp culture area and to optimize the composition of water used in terms of the major ions (concentration and ratio) and salinity
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